Test Bank For Genetics From Genes to Genomes 5th Edition By Hartwell

Chapter 03 Extensions to Mendel’s Laws     
Multiple Choice Questions
  1.  Which of the following is not a phenotypic description of allele interactions affecting the expression of traits?  
A.  incomplete dominance 
B.  codominance 
C.  polymorphic 
D.  multifactorial 
E.  pleiotrophic   
Bloom's: 1. Remember
Learning Objective: 03.01.01 Categorize allele interactions as completely dominant, incompletely dominant, or codominant.
Section: 03.01
Topic: Extensions to Mendel for Single-Gene Inheritance
  2.  If a phenotype is controlled by the genotypes at two different loci the interaction of these genes is called  
A. epistasis.
B. epigenetics.
C. dominance.
D. codominance.
E. incomplete dominance.   
Bloom's: 1. Remember
Learning Objective: 03.02.02 Infer from the results of crosses the existence of interactions between alleles of different genes including complementation, epistasis, and redundancy.
Section: 03.02
Topic: Extensions to Mendel for Multifactorial Inheritance
  3.  What would be an explanation for the phenomenon where a cross of a purebred, female, red eyed fruit fly with a purebred male, white eyed fly resulted in a phenotypic ratio that has a significantly greater number of red eyed flies than would be predicted by using Mendel's laws?  
A.  The red eye allele is dominant and sex linked. 
B.  The white eye allele is dominant and sex linked 
C.  The red eye allele is recessive and lethal 
D.  The white eye allele is recesive and lethal 
E. male pattern baldness   
Bloom's: 1. Remember
Learning Objective: 03.01.02 Recognize progeny ratios that imply the existence of recessive lethal alleles.
Section: 03.01
Topic: Extensions to Mendel for Single-Gene Inheritance
  4.  What can explain the phenomenon where the same genotype might give rise to different phenotypes?  
A. pleiotropy
B. codominance
C. incomplete dominance
D. complete dominance
E. penetrance and expressivity   
Bloom's: 2. Understand
Learning Objective: 03.02.03 Recognize when a given genotype in different individuals does not correspond to the same phenotype.
Section: 03.02
Topic: Extensions to Mendel for Multifactorial Inheritance
  5.  Which of the following phenotypic ratios show incomplete dominance?  
A.  2:1 
B.  3:1 
C.  1:2:1 
D.  1:1 
E.  4:1   
Bloom's: 3. Apply
Learning Objective: 03.01.01 Categorize allele interactions as completely dominant, incompletely dominant, or codominant.
Section: 03.01
Topic: Extensions to Mendel for Single-Gene Inheritance
  6.  Which of the following ratios show codominance?  
A.  2:1 
B.  3:1 
C.  1:2:1 
D.  1:1 
E.  4:1   
Bloom's: 3. Apply
Learning Objective: 03.01.01 Categorize allele interactions as completely dominant, incompletely dominant, or codominant.
Section: 03.01
Topic: Extensions to Mendel for Single-Gene Inheritance
  7.  Which of the following ratios indicates a lethal gene?  
A.  2:1 
B.  3:1 
C.  1:2:1 
D.  1:1 
E.  4:1   
Bloom's: 3. Apply
Learning Objective: 03.01.02 Recognize progeny ratios that imply the existence of recessive lethal alleles.
Section: 03.01
Topic: Extensions to Mendel for Single-Gene Inheritance
  8.  The gene that controls ABO blood type phenotype demonstrate which of the following inheritance patterns?  
A. complete dominance.
B. recessiveness.
C. codominance.
D. complete dominance, recessiveness, and codominance
E. none of the choices is correct.   
Bloom's: 3. Apply
Learning Objective: 03.01.01 Categorize allele interactions as completely dominant, incompletely dominant, or codominant.
Section: 03.01
Topic: Extensions to Mendel for Single-Gene Inheritance
  9.  Which of the following ratios demonstrate gene interaction?  
A.  2:1 
B.  3:1 
C.  1:2:1 
D.  9:3:4 
E.  1:3   
Bloom's: 3. Apply
Learning Objective: 03.02.01 Conclude from the results of crosses whether a single gene or multiple genes control a trait.
Section: 03.02
Topic: Extensions to Mendel for Multifactorial Inheritance
  10.  If a gene is monomorphic in a population the most likely phenotypic ratio  for the trait that would be obtained from a cross between two random individuals in the population would be  
A.  2:1 
B.  Cannot be predicted 
C.  1 
D.  3:1   
Bloom's: 1. Remember
Learning Objective: 03.01.03 Predict from the results of crosses whether a gene is polymorphic or monomorphic in a population.
Section: 03.01
Topic: Extensions to Mendel for Single-Gene Inheritance
  11.  The phenotypic ratio 2:1 may indicate  
A.  complete dominance. 
B.  codominance. 
C.  epistasis. 
D.  recessive lethal. 
E.  codominance and epistasis only.   
Bloom's: 3. Apply
Learning Objective: 03.01.02 Recognize progeny ratios that imply the existence of recessive lethal alleles.
Section: 03.01
Topic: Extensions to Mendel for Single-Gene Inheritance
  12.  The phenotypic ratio 9:7 may indicate  
A.  complete dominance. 
B.  codominance. 
C.  epistasis. 
D.  recessive lethal. 
E.  complementary gene action.   
Bloom's: 3. Apply
Learning Objective: 03.02.02 Infer from the results of crosses the existence of interactions between alleles of different genes including complementation, epistasis, and redundancy.
Section: 03.02
Topic: Extensions to Mendel for Multifactorial Inheritance
  13.  The phenotypic ratio 9:3:4 may indicate  
A.  complete dominance. 
B.  codominance. 
C.  epistasis. 
D.  recessive lethal. 
E.  codominance and epistasis only.   
Bloom's: 3. Apply
Learning Objective: 03.02.02 Infer from the results of crosses the existence of interactions between alleles of different genes including complementation, epistasis, and redundancy.
Section: 03.02
Topic: Extensions to Mendel for Multifactorial Inheritance
  14.  Which ratio would indicate that a phenotype is controlled by multiple genes?  
A.  3:1 
B.  2:1 
C.  1:2:1 
D.  9:3:3:1.   
Bloom's: 3. Apply
Learning Objective: 03.02.01 Conclude from the results of crosses whether a single gene or multiple genes control a trait.
Section: 03.02
Topic: Extensions to Mendel for Multifactorial Inheritance
    In rats, the allele for pigmentation (P) is dominant to the allele for albinism (p). The gene for black pigmentation (B) is dominant to the gene for cream pigmentation (b). If the dominant P allele is absent, gene B is inoperative.   15.  Predict the genotypes and phenotypes of the F1 progeny of a cross between a homozygous black rat and an albino homozygous for cream.  
A.  PPBB, black 
B.  PpBb, black 
C.  PpBb, albino 
D.  ppBb, albino   
Bloom's: 3. Apply
Learning Objective: 03.02.02 Infer from the results of crosses the existence of interactions between alleles of different genes including complementation, epistasis, and redundancy.
Section: 03.02
Topic: Extensions to Mendel for Multifactorial Inheritance
  16.  Predict the phenotypic ratio of the F2 progeny of a parental cross between a homozygous black rat and an albino homozygous for cream.  
A.  1 albino : 2 black : 1 cream 
B.  9 black : 3 cream : 4 albino 
C.  9 black : 3 albino : 4 cream 
D.  12 black : 3 cream : 1 albino 
E.  12 black : 3 albino : 1 cream   
Bloom's: 3. Apply
Learning Objective: 03.02.02 Infer from the results of crosses the existence of interactions between alleles of different genes including complementation, epistasis, and redundancy.
Section: 03.02
Topic: Extensions to Mendel for Multifactorial Inheritance
    In the common daisy, the genes A/a and B/b represent two pairs of alleles acting on flower color. A and B are required for color. The alleles of these two genes show recessive epistasis. The two gene pairs together thus show duplicate recessive epistasis.   17.  Predict the genotypes and phenotypes of the F1 progeny of a cross between two colorless plants, one homozygous for A and the other homozygous for B.  
A.  AAbb, colorless 
B.  aaBB, colorless 
C.  AaBb, colored 
D.  AaBb, colorless 
E.  aabb, colored   
Bloom's: 3. Apply
Learning Objective: 03.02.02 Infer from the results of crosses the existence of interactions between alleles of different genes including complementation, epistasis, and redundancy.
Section: 03.02
Topic: Extensions to Mendel for Multifactorial Inheritance
  18.  Predict the phenotypic ratio of the F2 progeny of a cross between two colorless plants, one homozygous for A and the other homozygous for B.  
A.  3 colored : 1 colorless 
B.  9 colored : 7 colorless 
C.  9 colorless : 7 colored 
D.  15 colorless : 1 colored 
E.  15 colored : 1 colorless   
Bloom's: 3. Apply
Learning Objective: 03.02.02 Infer from the results of crosses the existence of interactions between alleles of different genes including complementation, epistasis, and redundancy.
Section: 03.02
Topic: Extensions to Mendel for Multifactorial Inheritance
  19.  A certain disease is caused by homozygosity of the g allele (G is the corresponding wild-type allele). However, the penetrance of the disease is 75%. Two individuals known to be heterozygotes have a child. What is the probability that the child exhibits the disease?  
A.  1/4 
B.  3/4 
C.  1/8 
D.  3/16 
E.  9/16 The child will exhibit the phenotype only if its genotype is gg. And if its genotype is gg, a 75% penetrance means that there is only a 75% chance that the gg genotype will cause the child to exhibit the phenotype. The chance that two heterozygotes (Gg Gg) have a gg child is 1/4. Multiplying this probability by 75% gives 1/4 3/4 = 3/16   
Bloom's: 4. Analyze
Learning Objective: 03.02.03 Recognize when a given genotype in different individuals does not correspond to the same phenotype.
Section: 03.02
Topic: Extensions to Mendel for Multifactorial Inheritance
  20. A number of interacting genes produce quantitative inheritance. The transmission of these genes can be seen in the phenotypical pattern of 
A. discontinuous distribution of discrete phenotypes.
B. continuous variation in phenotypic expression.
C. strict dominance and recessiveness.
D. only discontinuous distribution of discrete phenotypes and continuous variation in phenotypic expression.   
Bloom's: 2. Understand
Learning Objective: 03.02.04 Explain how continuous traits, like human height and skin color, are controlled by multiple alleles of multiple genes.
Section: 03.02
Topic: Extensions to Mendel for Multifactorial Inheritance
  21.  In some plants, a purple pigment is synthesized from a colorless precursor. In a cross between two parental plants, one purple and the other colorless, an F1 generation was produced that was all purple. The F2 produced from the F1 had 775 purple, 200 red and 65 colorless plants. What mode of inheritance and phenotypic ratio do these results suggest?  
A.  Incomplete dominance, 1:2:1 phenotype ratio 
B.  Dominant epistasis, 12:3:1 phenotype ratio 
C.  Codominance, 1:2:1 phenotype ratio 
D.  Recessive epistasis, 9:3:4 phenotype ratio   
Bloom's: 4. Analyze
Learning Objective: 03.02.02 Infer from the results of crosses the existence of interactions between alleles of different genes including complementation, epistasis, and redundancy.
Section: 03.02
Topic: Extensions to Mendel for Multifactorial Inheritance